Lead insulating fault detecting method and device based on frequency spreading reflection

A technology for fault detection and wire insulation, which is applied in the detection of faults, measuring devices, and fault locations using the pulse reflection method. Value autocorrelation characteristics, improved ranging accuracy, and less noise interference

Inactive Publication Date: 2010-12-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The working frequency of this method is relatively high, between hundreds of megahertz and several gigahertz, it is difficult to implement with hardware, and it is greatly affected by noise interference
[0009

Method used

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  • Lead insulating fault detecting method and device based on frequency spreading reflection
  • Lead insulating fault detecting method and device based on frequency spreading reflection
  • Lead insulating fault detecting method and device based on frequency spreading reflection

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Embodiment Construction

[0032] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0033] see figure 1 A clock circuit 1 composed of an active or passive crystal oscillator generates a high-frequency clock signal and sends it to the m-sequence generation circuit 2 and filter circuit 3 . The higher the clock frequency, the higher the accuracy of fault location. However, hardware cost, electromagnetic compatibility and chip performance need to be considered. Generally, dozens to hundreds of megahertz are selected.

[0034] The filter circuit 3 is used to filter the higher harmonics of the clock signal to obtain the sinusoidal fundamental wave. The main component is a band-pass filter (such as a SAW (Surface Acoustic Wave) filter) whose center frequency is consistent with the frequency of the clock circuit 1 . After the clock signal passes through the circuit, the high-frequency harmonic part is filtered out, leaving the sinusoidal fu...

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Abstract

The invention discloses lead insulating fault detecting method and device based on frequency spreading reflection. By using a BPSK (Binary Phase Shift Keying) modulated m sequence as a detecting signal of a lead fault and calculating the cross-correlation function of the detecting signal and a reflecting signal, the position and severity of the fault are confirmed. The device designed according to the method comprises a clock circuit, a filter circuit, an m sequence generating circuit, a BPSK modulating and emitting circuit, a sampling circuit, a CPLD (Complex Programmable Logic Device) chip and display equipment. The invention has the characteristics of high interference resistance and high positioning precision and can be used for the real-time detection of the lead fault.

Description

technical field [0001] The invention relates to a method and a device for detecting wire insulation faults, in particular to a method and device for diagnosing and locating wire insulation faults based on the principle of spread spectrum reflection. Background technique [0002] Conductors, as information and energy carriers, are widely used in various instruments and equipment, and their safety and stability are increasingly valued by people. With the increase of equipment running time, the wires work in complex environments such as electricity, cold and heat, vibration and radiation for a long time, which will cause insulation wear, aging, corrosion and deformation and other faults, and eventually lead to open circuit or short circuit. Detecting and eliminating early insulation failures can help avoid potentially catastrophic failures, eliminate potential hazards and reduce repair costs. At present, the more mature wire insulation fault detection methods and devices are a...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/11
Inventor 张俊民周小猛
Owner BEIHANG UNIV
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